Shortest path with the cost of the dynamic links

Hello world

My name is Martini. I am a student at Chulalongkorn University. I work on my study and face some problems.

My study uses Oracle 11 g R2 data network model.

First, I created a network based on the table of table of nodes and links. The cost of links depends on the travel time. Now, I'm trying to calculate the shortest path between two nodes.

I also find the way to update (set) the cost of the links of each four periods below

Period 1 = 6.00 - 9.00-> table 1
Period 2 = 9.00 - 16.00-> table 2
Period 3 = 16.00 - 19.00-> table 3
Period 4 = 19.00 - 6, 00-> table 4

The challenge is that while I'm computer most short way how can I update the cost of the links is changed at the same time (four times) at the same time.

For example

The man traveling from node A to node Z

The man starts on the node at 6:30 and reach the node D at 9:00. -> The cost of the links of this phase should be table 1.

Then, he goes from node D at 9:00 at another node. -> The cost of the links of this phase should be table 2.

In conclusion, how can I calculate the shortest path to the data that have parameters of the independent. (time is independent secondary parameter for this case)

For those who may know, I appreciate for helping me solve this challenge in advance.

Gérard

Hello
You could model the cost of binding as a function depending on the time.
Based on the present, you will get a cost of specific binding of your source (4 tables).
that is, each link has 4 possible costs according to the time.
In IFN 11 GR 2, you could model these time dependent links cost with a binding cost calculator.
The implementation of binding costs calculator contains time information trip current.
It will also determine the what link cost to return to the scan engine based on the current travel time.
The cost of link should be based on the time of travel, so the path reflects the total travel time.

I hope that helps!

Jack

Tags: Database

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